221002120220 has 24 divisors (see below), whose sum is σ = 530405088864. Its totient is φ = 75772155456.

The previous prime is 221002120217. The next prime is 221002120289. The reversal of 221002120220 is 22021200122.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 221002120195 and 221002120204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 789293147 + ... + 789293426.

It is an arithmetic number, because the mean of its divisors is an integer number (22100212036).

Almost surely, 2^221002120220 is an apocalyptic number.

221002120220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221002120220 is an abundant number, since it is smaller than the sum of its proper divisors (309402968644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221002120220 is a wasteful number, since it uses less digits than its factorization.

221002120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578586589 (or 1578586587 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 221002120220 its reverse (22021200122), we get a palindrome (243023320342).

The spelling of 221002120220 in words is "two hundred twenty-one billion, two million, one hundred twenty thousand, two hundred twenty".